T8: Rust open_vst_gui command - floating window + HWND via raw-window-handle

src-tauri/src/lib.rs

@@ -17,6 +17,8 @@ use tauri_plugin_shell::ShellExt;
 use std::path::{Path, PathBuf};
 use std::sync::Mutex;
 
+mod vst_gui;
+
 struct EngineProcess(Mutex<Option<CommandChild>>);
 
 /// Các vị trí có thể chứa daw_engine, theo thứ tự ưu tiên.
@@ -73,6 +75,7 @@ pub fn run() {
     tauri::Builder::default()
         .plugin(tauri_plugin_shell::init())
         .plugin(tauri_plugin_dialog::init())
+        .invoke_handler(tauri::generate_handler![vst_gui::open_vst_gui])
         .setup(|app| {
             let res_dir = app
                 .path()

src-tauri/src/vst_gui.rs

@@ -0,0 +1,44 @@
+// VST GUI windows (spec vsti_gui): floating child window per (track, plugin).
+//
+// T8: command `open_vst_gui(plugin_id, track_id)` tao WebviewWindow noi
+// label `vst_gui_{track}_{plugin}`, 800x600, always-on-top; mo lai thi focus.
+// raw_window_handle() lay HWND (Windows) — T9 se attach native VST3/VST2
+// editor vao HWND cua window nay. Chua load plugin GUI (T9), chi placeholder.
+use raw_window_handle::HasWindowHandle;
+use tauri::{AppHandle, Manager, WebviewUrl, WebviewWindowBuilder};
+
+/// Mo (hoac focus neu da mo) cua so VST GUI cho 1 (track, plugin).
+/// Tra ve chuoi trang thai cho JS log — khong throw.
+#[tauri::command]
+pub fn open_vst_gui(
+    app: AppHandle,
+    plugin_id: String,
+    track_id: String,
+) -> Result<String, String> {
+    let label = format!("vst_gui_{}_{}", track_id, plugin_id);
+    if let Some(win) = app.get_webview_window(&label) {
+        win.set_focus().map_err(|e| e.to_string())?;
+        return Ok(format!("focused: {}", label));
+    }
+    let win = WebviewWindowBuilder::new(&app, &label, WebviewUrl::App("vst_gui.html".into()))
+        .title(format!("VST GUI - {}", plugin_id))
+        .inner_size(800.0, 600.0)
+        .always_on_top(true)
+        .build()
+        .map_err(|e| e.to_string())?;
+    let _ = win.set_focus();
+    // HWND cho native editor attach (T9). Log de verify — chua dung.
+    match win.window_handle() {
+        Ok(raw) => {
+            let raw = raw.as_raw();
+            #[cfg(target_os = "windows")]
+            if let raw_window_handle::RawWindowHandle::Win32(h) = raw {
+                println!("[vst_gui] {} hwnd={:?}", label, h.hwnd);
+            }
+            #[cfg(not(target_os = "windows"))]
+            let _ = raw;
+        }
+        Err(e) => println!("[vst_gui] {} raw_window_handle error: {}", label, e),
+    }
+    Ok(format!("opened: {}", label))
+}